Fix DOC_task_2_pdf_form_fill warmup: resolve Master PDF Editor .deb URL dynamically (pinned 5.9.91 URL now 404s)

tasks/DOC/DOC_task_2_pdf_form_fill.md

@@ -293,7 +293,7 @@ def grade(**kwargs) -> dict:
 
 ```bash
 which okular >/dev/null 2>&1 || (apt-get update -qq && DEBIAN_FRONTEND=noninteractive apt-get install -y -qq okular okular-extra-backends) || true
-which masterpdfeditor5 >/dev/null 2>&1 || (curl -fsSLo /tmp/mpe.deb https://get.code-industry.net/public/master-pdf-editor-5.9.91-qt5.x86_64.deb && DEBIAN_FRONTEND=noninteractive apt-get install -y -qq /tmp/mpe.deb) || true
+which masterpdfeditor5 >/dev/null 2>&1 || (MPE_URL=$(curl -fsSL https://code-industry.net/free-pdf-editor/ | grep -oE 'https://[a-zA-Z0-9./_-]*master-pdf-editor-[0-9.]+(-[0-9]+)?-qt5\.x86_64\.deb' | head -n1); [ -n "$MPE_URL" ] && curl -fsSLo /tmp/mpe.deb "$MPE_URL" && DEBIAN_FRONTEND=noninteractive apt-get install -y -qq /tmp/mpe.deb) || true
 pip install -q pypdf pillow reportlab || true
 pdfinfo /tmp_workspace/lease_agreement.pdf >/dev/null 2>&1 || true
 apt-get install -y -qq tesseract-ocr || true